The classic proportions for a Between the Sheets are most often quoted as being:
30ml (1oz) Light rum
30ml (1oz) Cognac brandy
30ml (1oz) Triple sec...
A little too sweet for me. My wife liked it, but I prefer to cut the triple sec with something sharp like tequila. I’d rather have a rum drink over ice to dilute it a bit more as I’m drinking so this cocktail probably wasn’t right for me from the get-go.